I have a custom .280 (not improved) that I have been shooting for several years. We have never used anything but standard brass. Rem.- Win. I bought a 100 rounds of nickel back at the first of this year and have been shooting with these and I can't seem to tell any difference. I don't know about the excessive wear on reloading dies.
just another comment: the loading tool i use is the collet die from lee. it kinda squeezes the neck down by mashing it against a mandrel. the builder of the rifle recommended it, so that's what i use, it works and that's okay
I don't use nickel, think about it, you have a layer of soft brass between 2 layers of harder, much more brittle nickel, that nickel is harder than your rifles chamber or your dies. but thin enough you can bend it while sizing. after bending it a few times it starts to crack, then flakes off. I don't want nickel steel flakes in my chambers or dies. When I first had my 25wssm built, the only way to get brass was buy win. supreme ammo and shoot it. the 3rd loading I started seeing the nickel flake off around the neck/shoulder juction. I trashed it and will not use it again. its pretty and its durable if you may carry it for years, but not good for reloading. RR